Get your vitamin D3 requirements in a tasty, liquid, olive-oil formula. This highly concentrated solution requires just 2 drops to provide 4000 IU of vitamin D3 (cholecalciferol). Every cell in your body needs vitamin D for your optimal well-being. Vitamin D is called the "Sunshine Vitamin" because it is produced naturally by the body after exposure to approximately ½ hour of sunlight depending on such variables as skin type and time of day. Many people develop vitamin D deficiencies due to lack of sun exposure for various reasons. Vitamin D is most well known for its contribution to supporting bone health by helping the body absorb calcium. It is especially important to intake adequate vitamin D levels, to help maintain healthy bones throughout our life cycle. Vitamin D-3 is vital for many functions in our bodies. Vitamin D also influences a host of key biological functions vital to health and well-being. Supports Bone and Muscle Health. Dietary Supplement. Gluten Free. Kosher Parve.